feat: change configuration file format

[sileht]

This change changes the configuration format to:

scopes:
  merge_queue_scope: merge-queue
  source:
    files:
      js:
        include:
          - "**/*.js"
      python:
        include:
          - "**/*.py"
      other:
        include:
          - "**/*"
        exclude:
          - "**/*.py"
          - "**/*.js"

Sources will later have value like: bazel, nx, turporepo

We will have something like:

scopes:
  merge_queue_scope: merge-queue
  source:
    nx:
      command: ["npx", "nx"]

To get the scopes, this will run: npx nx show projects --affected --base={base} --head={head}"

Depends-On: #808

[sileht]

This pull request is part of a stack:

1. fix: better handling of GitHub events (#808)
2. feat: change configuration file format (#811) 👈

[mergify]

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• depends-on = Mergifyio/mergify-cli#808 [⛓️ fix: better handling of GitHub events #808]

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[mergify]

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